ADD: script to change uid on a UL magic tag which uses backdoor commands

client/scripts/ul_uid.lua

@@ -0,0 +1,95 @@
+local getopt = require('getopt')
+local utils =  require('utils')
+
+local bxor = bit32.bxor
+
+example = "script run ul_uid"
+author = "Iceman"
+desc =
+[[
+This is a script that tries to set UID on a mifare Ultralight magic card which answers to chinese backdoor commands 
+
+Arguments:
+	-h		this help
+	-u		UID (14 hexsymbols)
+]]
+--- 
+-- A debug printout-function
+function dbg(args)
+    if type(args) == "table" then
+		local i = 1
+		while args[i] do
+			dbg(args[i])
+			i = i+1
+		end
+	else
+		print("###", args)
+	end	
+end	
+--- 
+-- This is only meant to be used when errors occur
+function oops(err)
+	print("ERROR: ",err)
+end
+--- 
+-- Usage help
+function help()
+	print(desc)
+	print("Example usage")
+	print(example)
+end
+
+--- 
+-- The main entry point
+function main(args)
+
+	print( string.rep('--',20) )
+	print( string.rep('--',20) )	
+	print()
+
+	local uid = '04112233445566'
+	
+	-- Read the parameters
+	for o, a in getopt.getopt(args, 'hu:') do
+		if o == "h" then return help() end
+		if o == "u" then uid = a end
+	end
+
+	-- uid string checks
+	if uid == nil then return oops('empty uid string') end
+	if #uid == 0 then return oops('empty uid string') end
+	if #uid ~= 14 then return oops('uid wrong length. Should be 7 hex bytes') end
+
+	local uidbytes = utils.ConvertHexToBytes(uid)
+	
+	local bcc1 = bxor(bxor(bxor(uidbytes[1], uidbytes[2]), uidbytes[3]), 0x88)
+	local bcc2 = bxor(bxor(bxor(uidbytes[4], uidbytes[5]), uidbytes[6]), uidbytes[7])
+	
+	local block0 = string.format('%02X%02X%02X%02X', uidbytes[1], uidbytes[2], uidbytes[3], bcc1)
+	local block1 = string.format('%02X%02X%02X%02X', uidbytes[4], uidbytes[5], uidbytes[6], uidbytes[7])
+	local block2 = string.format('%02X%02X%02X%02X', bcc2, 0x48, 0x00, 0x00)
+	
+	print('new UID | '..uid)
+	
+	core.clearCommandBuffer()
+
+	-- write block 0
+	core.console("hf 14a raw -p -a -b 7 40")
+	core.console("hf 14a raw -p -a 43")
+	core.console("hf 14a raw -c -a A200"..block0)
+
+	-- write block 1
+	core.console("hf 14a raw -p -a -b 7 40")
+	core.console("hf 14a raw -p -a 43")
+	core.console("hf 14a raw -c -a A201"..block1)
+
+	-- write block 2	
+	core.console("hf 14a raw -p -a -b 7 40")
+	core.console("hf 14a raw -p -a 43")
+	core.console("hf 14a raw -c -a A202"..block2)
+
+	--halt
+	core.console("hf 14a raw -c -a 5000")
+end
+
+main(args)